Potion/internal/app/service/engagement_service.go

package service

import (
	"fmt"

	domain "github.com/haydenhargreaves/Potion/internal/domain/engagement"
	domainRecipe "github.com/haydenhargreaves/Potion/internal/domain/recipe"
	_ "github.com/lib/pq"
)

type EngagementService struct {
	engagementRepository domain.EngagementRepository
	recipeRepository     domainRecipe.RecipeRepository
}

// Compile-time check to ensure the EngagementService implements domain.EngagementService
var _ domain.EngagementService = (*EngagementService)(nil)

// NewUserRepository creates a user repository object which is used by the user service to access
// the database. Any user related database operations will take place in this repository.
func NewEngagementService(engagementRepository domain.EngagementRepository, recipeRepository domainRecipe.RecipeRepository) domain.EngagementService {
	return &EngagementService{
		engagementRepository: engagementRepository,
		recipeRepository:     recipeRepository,
	}
}

// ViewRecipe requires a user ID and a recipe ID to create an engagement record in the database.
// A message will be generated using the recipe data and then used to add a view engagement to the
// database.
func (s *EngagementService) ViewRecipe(recipeId int) (domain.Engagement, error) {
	recipe, err := s.recipeRepository.GetRecipe(recipeId, nil)
	if err != nil {
		return domain.Engagement{}, err
	}

	message := fmt.Sprintf("Viewed \"%s\"", recipe.Title)

	return s.engagementRepository.AddEntityEngagement(recipeId, message, domain.EngagementViewed)
}

// ShareRecipe requires a user ID and a recipe ID to create an engagement record in the database.
// A message will be generated using the recipe data and then used to add a view engagement to the
// database.
func (s *EngagementService) ShareRecipe(recipeId int) (domain.Engagement, error) {
	recipe, err := s.recipeRepository.GetRecipe(recipeId, nil)
	if err != nil {
		return domain.Engagement{}, err
	}

	message := fmt.Sprintf("Shared \"%s\"", recipe.Title)

	return s.engagementRepository.AddEntityEngagement(recipeId, message, domain.EngagementShared)
}

// UserViewRecipe requires a user ID and a recipe ID to create an engagement record in the database.
// A message will be generated using the recipe data and then used to add a view engagement to the
// database.
func (s *EngagementService) UserViewRecipe(userId, recipeId int) (domain.Engagement, error) {
	recipe, err := s.recipeRepository.GetRecipe(recipeId, &userId)
	if err != nil {
		return domain.Engagement{}, err
	}

	message := fmt.Sprintf("Viewed \"%s\"", recipe.Title)

	return s.engagementRepository.AddUserEntityEngagement(userId, recipeId, message, domain.EngagementViewed)
}

// UserFavoriteRecipe requires a user ID and a recipe ID to create an engagement record in the database.
// A message will be generated using the recipe data and then used to add a like engagement to the
// database.
func (s *EngagementService) UserFavoriteRecipe(userId, recipeId int) (domain.Engagement, error) {
	recipe, err := s.recipeRepository.GetRecipe(recipeId, &userId)
	if err != nil {
		return domain.Engagement{}, err
	}

	// Update the favorites DB
	liked, err := s.engagementRepository.UserFavoriteRecipeToggle(userId, recipeId)
	if err != nil {
		return domain.Engagement{}, err
	}

	// Determine if this like is a saving or unsaving
	var message string
	if liked {
		message = fmt.Sprintf("Saved \"%s\"", recipe.Title)
	} else {
		message = fmt.Sprintf("Unsaved \"%s\"", recipe.Title)
	}

	return s.engagementRepository.AddUserEntityEngagement(userId, recipeId, message, domain.EngagementLiked)

}

// UserMakeRecipe requires a user ID and a recipe ID to create an engagement record in the database.
// A message will be generated using the recipe data and then used to add a make engagement to the
// database.
func (s *EngagementService) UserMakeRecipe(userId, recipeId int) (domain.Engagement, error) {
	recipe, err := s.recipeRepository.GetRecipe(recipeId, &userId)
	if err != nil {
		return domain.Engagement{}, err
	}

	message := fmt.Sprintf("Made \"%s\"", recipe.Title)

	return s.engagementRepository.AddUserEntityEngagement(userId, recipeId, message, domain.EngagementMade)
}

// UserShareRecipe requires a user ID and a recipe ID to create an engagement record in the database.
// A message will be generated using the recipe data and then used to add a make engagement to the
// database.
func (s *EngagementService) UserShareRecipe(userId, recipeId int) (domain.Engagement, error) {
	recipe, err := s.recipeRepository.GetRecipe(recipeId, &userId)
	if err != nil {
		return domain.Engagement{}, err
	}

	message := fmt.Sprintf("Shared \"%s\"", recipe.Title)

	return s.engagementRepository.AddUserEntityEngagement(userId, recipeId, message, domain.EngagementShared)
}

// GetUserEngagement returns a list of the users most recent engagement entries. The number of records
// is determined by the limit passed into this function. The results are sorted, newest-to-oldest.
func (s *EngagementService) GetUserEngagement(userId, limit int) ([]domain.Engagement, error) {
	return s.engagementRepository.GetUserEngagement(userId, limit)
}